JPH05919U - Exhaust purification catalyst device - Google Patents

Exhaust purification catalyst device

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Publication number
JPH05919U
JPH05919U JP056253U JP5625391U JPH05919U JP H05919 U JPH05919 U JP H05919U JP 056253 U JP056253 U JP 056253U JP 5625391 U JP5625391 U JP 5625391U JP H05919 U JPH05919 U JP H05919U
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JP
Japan
Prior art keywords
catalyst device
purification catalyst
exhaust
oxygen concentration
exhaust gas
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP056253U
Other languages
Japanese (ja)
Other versions
JP2504265Y2 (en
Inventor
▲琢▼也 青木
良治 阿部
利一 桶谷
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Honda Motor Co Ltd
Original Assignee
Honda Motor Co Ltd
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Filing date
Publication date
Application filed by Honda Motor Co Ltd filed Critical Honda Motor Co Ltd
Priority to JP1991056253U priority Critical patent/JP2504265Y2/en
Priority to US07/878,598 priority patent/US5216880A/en
Publication of JPH05919U publication Critical patent/JPH05919U/en
Application granted granted Critical
Publication of JP2504265Y2 publication Critical patent/JP2504265Y2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
    • F01N3/2013—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating using electric or magnetic heating means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N9/00—Electrical control of exhaust gas treating apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2390/00—Arrangements for controlling or regulating exhaust apparatus
    • F01N2390/02—Arrangements for controlling or regulating exhaust apparatus using electric components only
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

Abstract

(57)【要約】 【目的】 排気浄化触媒装置の上流と下流に酸素濃度セ
ンサを備えて空燃比制御を行う内燃機関の始動時におけ
る触媒の活性化を促進して排気浄化効果を上げるように
した排気浄化触媒装置を提供する。 【構成】 内燃機関の排気経路３に介設された排気浄化
触媒装置５の上流と下流には酸素濃度センサ３ａ，３ｂ
を備える。排気浄化触媒装置５は、排気管３の上流側か
ら小容量反応部５ａと大容量反応部５ｂの２つの部分か
らなり、小容量反応部５ａにその導入排気を加熱するた
めのヒータ６を設ける。このヒータ６は２つの酸素濃度
センサ３ａ，３ｂの出力差が所定値より小なる時のみ発
熱するようにした制御部によって制御される。 (57) [Abstract] [Purpose] To enhance the exhaust gas purification effect by promoting the activation of the catalyst at the start of an internal combustion engine that has an oxygen concentration sensor upstream and downstream of an exhaust gas purification catalyst device and performs air-fuel ratio control. An exhaust purification catalyst device is provided. [Structure] Oxygen concentration sensors 3a and 3b are provided upstream and downstream of an exhaust purification catalyst device 5 provided in an exhaust path 3 of an internal combustion engine.
Equipped with. The exhaust purification catalyst device 5 comprises two parts, a small capacity reaction part 5a and a large capacity reaction part 5b from the upstream side of the exhaust pipe 3, and a heater 6 for heating the introduced exhaust gas is provided in the small capacity reaction part 5a. . The heater 6 is controlled by a control unit that generates heat only when the output difference between the two oxygen concentration sensors 3a and 3b is smaller than a predetermined value.

Description

【考案の詳細な説明】[Detailed description of the device]

【０００１】[0001]

【産業上の利用分野】[Industrial applications]

本考案は、内燃機関の排気浄化触媒装置に関し、特に、排気浄化触媒装置の上 流と下流に酸素濃度センサを備えて空燃比制御を行う内燃機関の始動時における 触媒の活性化を促進して排気の浄化効果を上げるようにした排気浄化触媒装置に 関する。 The present invention relates to an exhaust purification catalyst device for an internal combustion engine, and more particularly, to promoting activation of the catalyst at startup of an internal combustion engine that has an oxygen concentration sensor upstream and downstream of the exhaust purification catalyst device for air-fuel ratio control. The present invention relates to an exhaust gas purification catalytic device that enhances the exhaust gas purification effect.

【０００２】[0002]

【従来の技術】[Prior Art]

排気浄化触媒装置の上流と下流に酸素濃度センサを備えて空燃比制御を行う内 燃機関は、その２つの酸素濃度センサにより安定した空燃比フィードバック制御 を行うことができる。 一方、排気浄化触媒装置は、その排気導入側に排気を加熱するヒータを設け、 機関の冷始動時の排気を速やかに活性温度まで上昇させて触媒装置を機能させる 手法（特公昭４７−２０６５９号公報）が開示されている。 An internal combustion engine that has oxygen concentration sensors upstream and downstream of the exhaust purification catalyst device and performs air-fuel ratio control can perform stable air-fuel ratio feedback control using the two oxygen concentration sensors. On the other hand, the exhaust gas purification catalyst device is provided with a heater for heating the exhaust gas on the exhaust gas introduction side, so that the exhaust gas at the time of cold start of the engine is quickly raised to the activation temperature to make the catalyst device function (Japanese Patent Publication No. 47-20659). Gazette) is disclosed.

【０００３】[0003]

【考案が解決しようとする課題】[Problems to be solved by the device]

しかしながら、排気浄化触媒装置に排気加熱ヒータを備え、排気温度が低い場 合にも排気浄化触媒装置を機能するようにしたものは、触媒装置の排気の導入側 に設けた排気加熱ヒータの他に吐出側に温度検知器を必要とし、付加的な部品点 数の増加およびそのための付加的な工数増加を避けることができない。 However, an exhaust gas purification catalyst device equipped with an exhaust gas heater so that the exhaust gas purification catalyst device functions even when the exhaust gas temperature is low is not limited to the exhaust gas heater installed on the exhaust gas introduction side of the catalyst device. Since a temperature sensor is required on the discharge side, an increase in the number of additional parts and therefore an additional man-hour cannot be avoided.

【０００４】[0004]

【課題を解決するための手段】[Means for Solving the Problems]

上記課題を解決するために、２つの酸素濃度センサに挟まれている排気浄化触 媒装置にその導入排気を加熱するためのヒータとこのヒータの加熱を制御する制 御部を設け、この制御部はその２つの酸素濃度センサの出力差が所定値より小な る時のみ発熱するように排気浄化触媒装置を構成した。 In order to solve the above-mentioned problems, an exhaust gas purification catalyst device sandwiched between two oxygen concentration sensors is provided with a heater for heating the introduced exhaust gas and a control unit for controlling the heating of this heater. Configured an exhaust purification catalyst device so that heat is generated only when the output difference between the two oxygen concentration sensors is smaller than a predetermined value.

【０００５】[0005]

【作用】 排気浄化触媒装置に導入される排気の温度が低い時は、触媒装置の機能が低い ので２つの酸素濃度センサの出力の差が小さく、この差が所定値より小なる時は 制御部がヒータを制御して排気を加熱する。 排気の温度が上昇した時は、この加熱された排気により触媒装置は速やかに活 性化されて２つの酸素濃度センサの出力の差が大きくなり、この差が所定値より 大なる時は制御部はヒータ加熱を終了する。[Function] When the temperature of the exhaust gas introduced into the exhaust purification catalyst device is low, the function of the catalyst device is low, so the difference between the outputs of the two oxygen concentration sensors is small, and when this difference is smaller than the predetermined value, the control unit Controls the heater to heat the exhaust. When the temperature of the exhaust gas rises, the heated exhaust gas activates the catalytic device promptly and the difference between the outputs of the two oxygen concentration sensors becomes large. If this difference exceeds a predetermined value, the control unit Finishes heating the heater.

【０００６】[0006]

【実施例】【Example】

本考案の実施例を添付図面に基づいて以下に説明する。 図１は本考案に係る排気浄化触媒装置の機能構成図、図２はエンジンを中心と する信号のブロック図、図３は制御部の制御処理手順図、図４は２つの酸素濃度 センサの出力を示し、上流側（Ａ）、触媒不活性時の下流側（Ｂ）、触媒活性時 の下流側（Ｃ）の出力を示す出力図である。 Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a functional configuration diagram of an exhaust purification catalyst device according to the present invention, FIG. 2 is a block diagram of signals centering on an engine, FIG. 3 is a control processing procedure diagram of a control unit, and FIG. 4 is outputs of two oxygen concentration sensors. FIG. 4 is an output diagram showing the outputs of the upstream side (A), the downstream side (B) when the catalyst is inactive, and the downstream side (C) when the catalyst is active.

【０００７】 図２において、吸気管１は内燃エンジン２に接続し、この内燃エンジン２から 排気管３が接続し、夫々に設けられた各種のセンサ信号を処理して制御信号を発 する制御部４によって内燃エンジン２が統括される。In FIG. 2, an intake pipe 1 is connected to an internal combustion engine 2, an exhaust pipe 3 is connected from the internal combustion engine 2, and a control unit for processing various sensor signals provided for each and issuing a control signal. The internal combustion engine 2 is controlled by 4.

【０００８】 吸気管１には燃料噴射弁１ａ、スロットル弁１ｂ等が設けられ、また、排気管 ３には排気浄化触媒装置５が介設する。この排気浄化触媒装置５の上流と下流に 排気中の酸素濃度を検知する酸素濃度センサ３ａ，３ｂをそれぞれ備える。A fuel injection valve 1 a, a throttle valve 1 b, etc. are provided in the intake pipe 1, and an exhaust purification catalyst device 5 is provided in the exhaust pipe 3. Oxygen concentration sensors 3a and 3b for detecting the oxygen concentration in the exhaust gas are provided upstream and downstream of the exhaust purification catalyst device 5, respectively.

【０００９】 酸素濃度センサ３ａ，３ｂは、排出ガスの熱によって活性温度にまで上昇する と信号出力レベルが規定値に達して酸素濃度の検知が可能な状態となる。その出 力は制御部４に送られ、制御部４はエンジン回転数と負荷に応じて燃料噴射弁１ ａを制御し、安定した空燃比フィードバック制御が行われる。When the oxygen concentration sensors 3a and 3b rise to the activation temperature due to the heat of the exhaust gas, the signal output level reaches a specified value and the oxygen concentration can be detected. The output is sent to the control unit 4, and the control unit 4 controls the fuel injection valve 1a according to the engine speed and the load, and stable air-fuel ratio feedback control is performed.

【００１０】 図１において、排気浄化触媒装置５は、小容量反応部５ａと大容量反応部５ｂ の２つの部分からなり、排気経路３中に上流側から小容量反応部５ａと大容量反 応部５ｂの順に介設する。In FIG. 1, the exhaust purification catalyst device 5 is composed of two parts, a small-capacity reaction section 5a and a large-capacity reaction section 5b. The parts 5b are provided in this order.

【００１１】 小容量反応部５ａは小容量の三元触媒を内包し、かつ、導入された排気を加熱 するヒータ６を内部に組み込んで構成される。このヒータ６は、２つの酸素濃度 センサ３ａ，３ｂの出力差が所定値より小なる時のみ発熱するように所定の制御 手順を有する制御部４によって制御される。The small-capacity reaction section 5a is configured to include a small-capacity three-way catalyst therein and to incorporate therein a heater 6 for heating the introduced exhaust gas. The heater 6 is controlled by the control unit 4 having a predetermined control procedure so as to generate heat only when the output difference between the two oxygen concentration sensors 3a and 3b is smaller than a predetermined value.

【００１２】 このヒータ６の発熱によって小容量反応部５ａは昇温され、内燃エンジン２の 冷始動時においても、小容量反応部５ａの触媒は速やかに活性化される。また、 大容量反応部５ｂは三元触媒を内包した一般の構成を採る。The heat generated by the heater 6 raises the temperature of the small-capacity reaction section 5a, so that the catalyst of the small-capacity reaction section 5a is quickly activated even when the internal combustion engine 2 is cold-started. Further, the large-capacity reaction part 5b has a general structure including a three-way catalyst.

【００１３】 以上のごとき構成からなる本考案に係る排気浄化触媒装置５の作用を、制御部 ４の制御手順とともに説明する。The operation of the exhaust gas purification catalyst device 5 according to the present invention having the above-described configuration will be described together with the control procedure of the control unit 4.

【００１４】 図３において、ヒータ制御処理Ｓ１は、排気浄化触媒装置５の上流と下流に設 けた酸素濃度センサ３ａ，３ｂからその出力を読み込む処理Ｓ２と、これに続く 判別、演算を行う処理Ｓ２〜Ｓ５およびその結果として得られた排気浄化触媒装 置５の活性度に対応してヒータ指令を行う処理Ｓ６、Ｓ７を経て終了処理Ｓ８に 至る処理手順にて構成される。In FIG. 3, a heater control process S1 is a process S2 of reading the output from the oxygen concentration sensors 3a and 3b provided upstream and downstream of the exhaust purification catalyst device 5, and a process S2 of subsequent determination and calculation. .About.S5 and the resulting processing procedure from the processing S6 and S7 for issuing a heater command corresponding to the activity of the exhaust gas purification catalyst device 5 to the end processing S8.

【００１５】 先ず、ヒータ制御処理ステップＳ１が開始されると、センサ読込みステップＳ ２によって２つの酸素濃度センサ３ａ，３ｂの出力が読み込まれる。この出力は 、次のセンサ活性判別ステップＳ３に渡される。First, when the heater control processing step S1 is started, the outputs of the two oxygen concentration sensors 3a and 3b are read in the sensor reading step S2. This output is passed to the next sensor activity determination step S3.

【００１６】 センサ活性判別ステップＳ３の判別により、２つの酸素濃度センサ３ａ，３ｂ の出力がその活性化を示す所定値に達していない時は、ステップＳ７によってヒ ータ通電指令が出力される。When the outputs of the two oxygen concentration sensors 3a and 3b have not reached the predetermined values indicating the activation by the determination in the sensor activation determination step S3, the heater energization command is output in step S7.

【００１７】 また、２つの酸素濃度センサ３ａ，３ｂの出力が共にその活性化を示す所定値 に達していれば、触媒活性度算出ステップＳ４が、２つの酸素濃度センサ３ａ， ３ｂの出力差を基にして、後述する算出法によって排気浄化触媒装置５の触媒の 活性度を算出する。Further, if the outputs of the two oxygen concentration sensors 3a and 3b both reach a predetermined value indicating the activation thereof, the catalyst activity calculation step S4 determines the output difference of the two oxygen concentration sensors 3a and 3b. Based on this, the activity of the catalyst of the exhaust purification catalyst device 5 is calculated by the calculation method described later.

【００１８】 ステップＳ４によって得られた触媒の活性度を示す演算結果は、次の触媒活性 度判別ステップＳ５において、活性度の判別基準となる所定の基準値と比較する ことにより、活性基準に達していなければ、ステップＳ７によってヒータ通電指 令が出力され、また、活性基準に達していれば、ステップＳ６によってヒータ停 止指令が出力されてヒータ６による加熱が停止される。The calculation result indicating the activity of the catalyst obtained in step S4 reaches the activity standard by being compared with a predetermined reference value serving as a criterion of activity determination in the next catalyst activity determination step S5. If not, the heater energization instruction is output in step S7, and if the activation standard is reached, the heater stop command is output in step S6 and heating by the heater 6 is stopped.

【００１９】 ヒータ指令を出力するステップＳ６およびステップＳ７は、ヒータ指令処理と 共にヒータ作動フラグ処理を行い、終了処理ステップＳ８に至った後に制御部４ がヒータ作動フラグを検査する。このヒータ作動フラグがセット状態であれば再 びヒータ制御処理Ｓ１を繰り返す。In steps S6 and S7 for outputting the heater command, the heater operation flag process is performed together with the heater command process, and the control unit 4 inspects the heater operation flag after the end process step S8. If the heater operation flag is set, the heater control process S1 is repeated.

【００２０】 上記のヒータ制御処理Ｓ１は、内燃エンジン２の始動後、その排気温度が触媒 の活性温度に達するのに十分とされる所定の時間内で、かつ、バッテリ電圧が基 準を満たしている時に限り、また、上記ヒータ作動フラグがリセット状態になる まで、すなわち、ヒータ停止指令が出力されるまで制御部４において繰り返され る。また、この繰り返しを行う上記の所定の時間は、水温センサその他から得ら れる内燃エンジン２の始動時の状態に応じて調節される。The above heater control process S1 is carried out after the internal combustion engine 2 is started within a predetermined time sufficient for the exhaust temperature to reach the activation temperature of the catalyst, and when the battery voltage meets the standard. As long as the heater operation flag is reset, that is, until the heater stop command is output, the control unit 4 repeats the above. Further, the above-mentioned predetermined time for repeating this is adjusted according to the state at the time of starting the internal combustion engine 2 obtained from the water temperature sensor and the like.

【００２１】 上記処理手順における排気浄化触媒装置５の触媒の活性度は、排気浄化触媒装 置５を挟んで設けられた２つの酸素濃度センサ３ａ，３ｂの出力を基に、次に示 す理由に基づいて算出することができる。The reason why the catalyst activity of the exhaust purification catalyst device 5 in the above processing procedure is shown below based on the outputs of the two oxygen concentration sensors 3a and 3b provided with the exhaust purification catalyst device 5 in between. Can be calculated based on

【００２２】 図４において、センサの活性状態にあっては、上流側の酸素濃度センサ３ａは 、排気浄化触媒装置５による触媒反応前の排出ガスの酸素濃度を検知し、その出 力（Ａ）は、Ｖ０の範囲で各気筒の排気行程に対応して周期的に変動する。In FIG. 4, in the active state of the sensor, the upstream oxygen concentration sensor 3 a detects the oxygen concentration of the exhaust gas before the catalytic reaction by the exhaust purification catalyst device 5, and outputs the output (A). Fluctuates periodically within the range of V0 corresponding to the exhaust stroke of each cylinder.

【００２３】 排気浄化触媒装置５が活性化されていない時は触媒反応が行われず、排出ガス は排気浄化触媒装置５をそのまま通過して下流側の酸素濃度センサ３ｂに達する 。その出力（Ｂ）は、上流側の酸素濃度センサ３ａの出力（Ａ）と同じく、Ｖ０ の範囲で各気筒の排気行程に対応して周期的に変動する。When the exhaust purification catalyst device 5 is not activated, no catalytic reaction occurs, and the exhaust gas passes through the exhaust purification catalyst device 5 as it is and reaches the oxygen concentration sensor 3b on the downstream side. The output (B), like the output (A) of the oxygen concentration sensor 3a on the upstream side, periodically fluctuates in the range of V0 corresponding to the exhaust stroke of each cylinder.

【００２４】 また、排気浄化触媒装置５が活性化されている時は、排出ガスは排気浄化触媒 装置５中を通過する際に触媒反応が行われ、排出ガス中の酸素はＨＣ，ＣＯと反 応して下流側の酸素濃度センサ３ｂに達する。その出力（Ｃ）は、上流側の酸素 濃度センサ３ａの出力（Ａ）と比較すると、Ｖ０より小なる範囲で各気筒の排気 行程に対応して周期的に変動する。When the exhaust purification catalyst device 5 is activated, the exhaust gas undergoes a catalytic reaction when passing through the exhaust purification catalyst device 5, and oxygen in the exhaust gas reacts with HC and CO. Accordingly, the oxygen concentration sensor 3b on the downstream side is reached. Compared with the output (A) of the upstream oxygen concentration sensor 3a, the output (C) periodically fluctuates corresponding to the exhaust stroke of each cylinder in a range smaller than V0.

【００２５】 したがって、この２つの酸素濃度センサ３ａ，３ｂの出力差に基づいて、排気 浄化触媒装置５の活性度を知ることができる。この活性度に基づいて活性状態と 不活性状態の判別を行うには、排気浄化触媒装置５を活性状態として扱うべき基 準値を設定し、この基準値と比較することによって行うことができる。Therefore, the activity of the exhaust purification catalyst device 5 can be known based on the output difference between the two oxygen concentration sensors 3a and 3b. The determination of the active state and the inactive state based on this activity can be performed by setting a reference value for treating the exhaust purification catalyst device 5 as the active state and comparing it with this reference value.

【００２６】 なお、酸素濃度センサ３ａ，３ｂの出力差の算出においては、２つの酸素濃度 センサ３ａ，３ｂの出力が、上記の如く各気筒の排気行程に対応して周期的に変 動するので、各センサの波形がなす面積に基づいてセンサ出力として算出する特 願平２−１１７８９０号に開示する所定の処理による数値化を個別に行う。さら に、排気浄化触媒装置５の通過による時間差を踏まえて、排気浄化触媒装置５の 活性度が算出される。In the calculation of the output difference between the oxygen concentration sensors 3a and 3b, the outputs of the two oxygen concentration sensors 3a and 3b change periodically corresponding to the exhaust stroke of each cylinder as described above. The individual digitization is performed by a predetermined process disclosed in Japanese Patent Application No. 2-117890, which is calculated as a sensor output based on the area formed by the waveform of each sensor. Furthermore, the activity of the exhaust purification catalyst device 5 is calculated based on the time difference due to passage through the exhaust purification catalyst device 5.

【００２７】[0027]

【考案の効果】[Effect of the device]

以上に説明した如く、２つの酸素濃度センサに挟まれた排気浄化触媒装置にヒ ータとを設け、このヒータの制御部はその２つの酸素濃度センサの出力差が所定 値より小なる時のみ発熱するように排気浄化触媒装置を構成したので、排気浄化 触媒装置の活性度に応じてヒータの制御が行われる。 As described above, the heater is provided in the exhaust gas purification catalyst device sandwiched between the two oxygen concentration sensors, and the control unit of this heater is provided only when the output difference between the two oxygen concentration sensors is smaller than the predetermined value. Since the exhaust purification catalyst device is configured to generate heat, the heater is controlled according to the activity of the exhaust purification catalyst device.

【００２８】 したがって、排気浄化触媒装置の上流と下流に酸素濃度センサを備えて空燃比 フィードバック制御を行う内燃機関において、その排気浄化触媒装置の加熱のた めのヒータを設ける他には付加的な部品点数の増加およびそのための付加的な工 数増加を要することなく、触媒の即時活性化による冷始動時の排気浄化を図るこ とができる。Therefore, in an internal combustion engine that is equipped with oxygen concentration sensors upstream and downstream of the exhaust purification catalyst device to perform air-fuel ratio feedback control, a heater for heating the exhaust purification catalyst device is additionally provided. Exhaust gas purification at cold start can be achieved by immediate activation of the catalyst without increasing the number of parts and additional man-hours for that.

【図面の簡単な説明】[Brief description of drawings]

【図１】本考案に係る排気浄化触媒装置の機能構成図FIG. 1 is a functional configuration diagram of an exhaust gas purification catalyst device according to the present invention.

【図２】エンジンを中心とする信号のブロック図FIG. 2 is a block diagram of signals centered on the engine.

【図３】加熱制御部の制御処理手順図FIG. 3 is a control processing procedure diagram of a heating control unit.

【図４】上流側（Ａ）、触媒不活性時の下流側（Ｂ）、
触媒活性時の下流側（Ｃ）の各酸素濃度センサの出力を
示す出力図FIG. 4 is an upstream side (A), a downstream side (B) when the catalyst is inactive,
Output diagram showing the output of each oxygen concentration sensor on the downstream side (C) when the catalyst is activated

【符号の説明】[Explanation of symbols]

２ …内燃機関 ３ …排気経路 ３ａ…酸素濃度センサ ３ｂ…酸素濃度センサ ４ …制御部 ５ …排気浄化触媒装置 ５ａ…小容量反応部 ５ｂ…大容量反応部 ６ …ヒータ 2 ... Internal combustion engine 3 ... Exhaust path 3a ... Oxygen concentration sensor 3b ... Oxygen concentration sensor 4 ... Control part 5 ... Exhaust gas purification catalyst device 5a ... Small capacity reaction part 5b ... Large capacity reaction part 6 ... Heater

Claims (1)

【実用新案登録請求の範囲】 【請求項１】 内燃機関の排気経路に介設されて触媒反
応によってその排気を浄化する排気浄化触媒装置の上流
と下流に排気中の酸素濃度を検知する酸素濃度センサを
それぞれ備えて空燃比フィードバック制御を行うように
した内燃機関において、前記内燃機関の排気浄化触媒装
置にその導入排気を加熱するためのヒータとこのヒータ
の加熱を制御する制御部を設け、この制御部は前記内燃
機関の２つの酸素濃度センサの出力差が所定値より小な
る時のみ発熱するように制御することを特徴とする排気
浄化触媒装置。[Claims for utility model registration] [Claim 1] Oxygen concentration for detecting oxygen concentration in exhaust gas upstream and downstream of an exhaust purification catalyst device which is installed in an exhaust path of an internal combustion engine and purifies the exhaust gas by a catalytic reaction. In an internal combustion engine that is provided with respective sensors to perform air-fuel ratio feedback control, an exhaust gas purification catalyst device of the internal combustion engine is provided with a heater for heating the introduced exhaust gas and a control unit for controlling heating of the heater, An exhaust purification catalyst device, wherein the control unit controls so that heat is generated only when the output difference between the two oxygen concentration sensors of the internal combustion engine is smaller than a predetermined value.
JP1991056253U 1991-06-24 1991-06-24 Exhaust purification catalyst device Expired - Fee Related JP2504265Y2 (en)

Priority Applications (2)

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JP1991056253U JP2504265Y2 (en) 1991-06-24 1991-06-24 Exhaust purification catalyst device
US07/878,598 US5216880A (en) 1991-06-24 1992-05-05 Catalytic converter heater control system for internal combustion engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1991056253U JP2504265Y2 (en) 1991-06-24 1991-06-24 Exhaust purification catalyst device

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JPH05919U true JPH05919U (en) 1993-01-08
JP2504265Y2 JP2504265Y2 (en) 1996-07-10

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DE4406648C1 (en) * 1994-03-01 1995-08-10 Daimler Benz Ag Catalytic reduction of hydrocarbons, carbon monoxide and nitrogen oxides from i.c engine exhaust
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US5983628A (en) * 1998-01-29 1999-11-16 Chrysler Corporation System and method for controlling exhaust gas temperatures for increasing catalyst conversion of NOx emissions
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JPH0754645A (en) * 1993-07-12 1995-02-28 Robert Bosch Gmbh Method and equipment for heating catalyst in exhaust gas system of internal combustion engine
JPH0828252A (en) * 1994-07-12 1996-01-30 Nissan Motor Co Ltd Exhaust emission control device for internal combustion engine

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